Senior Full-Stack Engineer, Shopify & E-Commerce, Remote Job

The Opportunity We're hiring a Senior Full-Stack Engineer to help us build that engine faster, cleaner, and with fewer surprises after launch. This is a true full-stack role — spanning Shopify, custom frontend/backend systems, checkout and cart flows, subscriptions, experimentation infrastructure, tracking, and AI-assisted engineering workflows. It's built for someone who's already owned this kind of work as a Senior Full-Stack Engineer, Shopify/Ecommerce Engineer, or Lead Engineer at a DTC brand or agency, and wants to do it with more ownership and less red tape. What You’ll Own • 40% — Shopify, cart, checkout, and ecommerce funnel work • 25% — Custom web apps and services (React, Next.js, occasionally Vue) • 15% — Cloudflare Workers, reverse proxy, and split-testing infrastructure • 10% — Recharge / subscription and customer portal work • 10% — QA, release process, code review, and technical standards What You’ll Do • Build and maintain high-quality ecommerce experiences across Shopify and our custom infrastructure • Work with Shopify APIs, product/variant data, cart behavior, checkout constraints, and webhooks • Ship frontend experiences in React, Next.js, and occasionally Vue • Build backend services, integrations, and internal tools • Extend our Cloudflare Workers and reverse-proxy/split-testing infrastructure • Support A/B testing and experimentation across the ecommerce funnel • Improve subscription experiences — Recharge/customer portal flows, cancellations, product swaps, rebill logic, and retention features • Implement and validate tracking across experiments, attribution, and analytics (Amplitude, Elevar, PostHog, server-side tracking, or similar) • Use AI coding tools as leverage — to move faster, explore approaches, debug, and check your own work • Own pre-launch QA for high-impact launches: pricing tests, checkout changes, subscription changes, tracking updates • Catch edge cases before customers or the business do, and monitor launches after release • Communicate early and clearly — especially when something's risky, under-scoped, or likely to break What You Bring Required • Production experience with Shopify — Admin API, Storefront API, webhooks, product/variant/cart/checkout logic • Strong React and/or Next.js, plus TypeScript or strong modern JavaScript • Node.js (or similar) backend experience and solid API design chops • Comfort integrating third-party APIs, using Git/GitHub PR workflows, and owning production deployments • A track record of debugging production issues and building software that's fast, reliable, and maintainable • Sound judgment using AI dev tools — as an accelerant, not a substitute for engineering fundamentals Strongly Preferred • Recharge or a similar subscription platform (Skio, Stay.ai, Smartrr, Ordergroove, Loop, etc.) • Subscription flows: skips, delays, swaps, rebills, save offers • Shopify Functions / Checkout Extensibility • Cloudflare Workers, reverse proxies, or edge infrastructure • A/B testing or experimentation systems • Ecommerce analytics and tracking tools (Amplitude, Elevar, PostHog, server-side tracking) • Performance optimization for high-traffic ecommerce pages • Building internal tools for ecommerce, ops, or catalog management • Real, hands-on experience with AI-assisted coding workflows (Cursor, Claude Code, GitHub Copilot, ChatGPT, or similar) What Success Looks Like • Ecommerce launches ship faster, with fewer post-launch fire drills • High-impact Shopify, checkout, subscription, and tracking work needs less manual oversight from the CTO • A/B tests, pricing changes, and checkout updates are implemented cleanly and measured correctly • AI tools boost velocity without ever lowering the quality bar • The rest of the engineering team levels up from working alongside you Who Thrives Here • You ship quickly without being sloppy, and you test your own work before handing it off • You think in edge cases, not just happy paths — because you know ecommerce bugs cost real revenue • You can take a business problem, not just a polished ticket, and run with it • You push back — clearly and early — when something's risky or under-specified • You debug deeply instead of guessing, and you leave every system better than you found it • You care about conversion and customer experience as much as clean code • You raise the bar for everyone around you How We Think About AI We believe AI is a serious engineering advantage when it's used well. We want someone who uses it to explore approaches faster, write boilerplate, generate tests, debug, and review code — not someone who ships code because it appeared to work once. You should be able to look at AI-generated code and know immediately whether it's wrong, insecure, unscalable, or under-tested. No vibe coding. Use AI aggressively — but keep your engineering judgment firmly in the driver's seat. Logistics • Full-time, fully remote, EST working hours, US-based • Strong written and verbal English communication • Comfortable in a fast-moving startup environment where priorities shift fast Why This Role Rocks • Competitive Salary • 100% Company-Paid Health, Dental, Vision & Life Insurance for employees (Family coverage available at employee cost) • 401(k) Retirement Plan • Parental Leave • Free Access to Javvy Products • Career Growth Opportunities • Collaborative, Fast-Paced Start-Up Environment